Apparatus for testing the fading action of light



June 19, 1 923. 1,458,941 c. w. JAMESON APPARATUS FOR' TESTING THE FADIN G ACTION OF LIGHT Filed Ma? 23, 1921 2 Sheets-Sheet 1 z/ y I Y Z5 June 19, 1923. 1,458,941

c. w. JAMESON APPARATUS FOR TESTING THE FADING ACTION OF LIGHT Filed May 23. 1921 2 Sheets-Sheet 2 Patented June "'19, 1923.

CLARENCE W. J'AI IESON, OF LOMBABD, ILLINOIS.

APPARATUS FOR TESTING THE FADIN'G ACTION LIGHT.-

. Application filed May 23, 1921. Serial No. 471,946.

To all whom it may concern:

Be it known that I, CLARENCE W. JAME- SON, citizen of the United States, 'residin at Lombard, in the county of Du Page and State of Illinois, have invented a certain new and useful Improvement in Apparatus for Testing the Fading Action of Light,

of which the following is a full, clear,- concise, and exact description.

My invention relates to equipment employed for holding objects thatfare to be subject to the action'of light and finds one important use in positioning cloth or other object in relation to a source of artificial light to test the fading action of-li ht thereon, though the inventlon is not to limited to any particular use to which it may be put.

The equipment of my invention includes holder for cloth or other object that is to be subject to the actionof light, this holder having two portions for holding the ob ect firmly therebetween and permitting the passage of such light at one place and preventing it at another. The part of the object subjected to the li ht may be compared with the part not'sub ected to the llght 1n judging the "effect of the light upon the object.

My invention further includes a carrier forthe holder arranged to move with reference to a light shield that supports a source of artificial light, such as an electric arc lamp, that depends below the slneld. The carrier may be moved to one pos1t1on to aiford access to the lamp and to another position to place the holder in pos1t1on to be reached by the light. When the apparatus is in use the light shield and the carrier keep the light from striking the eyes of the operator, the light be1ng preferably extinguished when the carrier 1s ad usted to afford access to the lamp.

I will explain my invention more fnlly by reference to the accompany ng drawlngs showing the preferred embodlrnent thereof and in which Fig. 1 is a view 1n front elevation with parts broken away and parts shown in section, of an apparatus constructed in accordance withthe lnventlon, an alternative position of the carrler for the holder being shown in dot and dash lines; Fig. 2 is a sectional view on line 22 of Fi 1; Fig. 3 is a erspective view showing t e two parts of the cloth holder and cloth adapted to be held thereby, all in separated relation; and Fig. 4 is a erspective view showing a part of the pre erred formation of the carrier for the holder.

Like parts are indicated by similar characters of reference throughout the different figures.

The source of artificial light illustrated is in the form of an electric arc lamp 1 whose carbons 2 and 3 are provided with suitable electro-magnetic controlling mechanism whereby they are included in circuit and the length of the are between the carbons is automatically re ulated while the lamp is in circuit. Suc electro-magnetic mechanism is housed within the casing 4 and as it forms no novel part of my present invention it is not illustrated and will not be further described. The are lamp structure 1s supported upon a spider 5 that is located within and is secured to a tubular light shield 6 that is positioned to partially obstruct the light from the lamp. The support 5 for the arc. lamp is so disposed with respect to the shield 6 that the arc lamp, depending from said support, will project at its lower end sufficiently below the light shield to have the lighting center of the lamp below such shield. The spider 5 is supported by two upright cylindrical rods or posts 7 w ich in turn are supported upon the table 8 and which are of such length as to elevate the light shield and the lamp a desirable distance above said table which is provided with an opening 9 in line with the carbons of the lamp so that the lower carbon may be dropped through said opening in the lamp trimming operation. 7

Upright channel irons 10 are carried by the light shield 6 at diametrically opposite sides thereof. These channel irons constitute runways that receive the rollers 11 that are mounted upon a carrier 12 that is in the form of a sleeve surrounding or embracing the tubular light shield 6 that is between the carrier and lamp, the carrier being movable up and down along the light shield, the rollers 11 upon the carrier, in co-operation with the tracks thereon, guiding the carrier in its up and down movements. The carrier supports .two brackets 13 having horizontal branches that extend beneath the carrier and inwardly, these horizontal branches terminating in guiding rin 14 which surround the posts 7. Finger i olds 15 are carried by the brackets 13 and thumb levers 16 are pivoted upon said finger holds. Holding pins 17 are pivoted upon the thumb levers 16 and pro ect inwardly. When the carrier 12 is elevated these holding pins are positioned to be in registry with openings formed in the posts 7 whereupon springs 18 surrounding said pins and engaging shoulders 19 thereon serve to press said pins into said holes whereby the carrier is held in an elevated position. If the carrier is to be lowered the thumb levers are depressed whereupon the carrier may assume the position shown in dot and dash lines in Fig. 1, the rings 14 then resting upon the enlarged lower ends of the posts 7 as illustrated in said figure. By this arrangement the carrier may have a portion thereof moved into and out of line with the light shield and light source.

The carrier is preferably formed as illustrated in detail in Fig. 4, it being provided with a number of light transmitting openings 20 margined by upright ribs 21 and horizontal ribs 22, these ribs carrying discs 23 that extend into the spaces margined by the ribs. As illustrated, the carrier prevents the passage of light except where the light transmitting'openings 20 are located. When lowered, it constitutes a continuation of the light shield 6.

The cloth holder illustrated most clearly in Fig. 3 comprises a body portion 24 havlng inturned ears 25. The holder also includes a closure 26 carrying a spring 27 adapted to underlie the ears 25 when the closure is in place. The cloth or other object 28 that is to be subject to the fading action of the artificial light is placed within the body portion 24 of the holder, whereafte-r the closure 26 is positioned within the holder, the spring 27 serving to clamp the closure tightly against the cloth 28 and to press the cloth firmly against the back of the holder body. The two portions 24 and 26 of the holder have"registering areas 29 and 30 for transmitting the light therethrough. and registering areas 31 32 adjacent the areas 29 and 30 that prevent the passage of such light.

' There are two circular rows of openings 20 between which the ribs 22/intervene. There may therefore be an upper row of holders 'which-may be bottomed upon the top surfaces of the ribs 22.

The lower row of suchjholders may be bottomed within the ears-33 that are disposed sufficiently below the lower row of openings 20. The portions of the carriers that support said holders maybe brought into'and out ofline with the light shield and light source.

When the lamp is to be inspected or adjusted the carrier is elevated. When the apparatus is being loaded with the cloth or other objects that are to be subject to the light the carrier 12 may be either in its elevated or lowered position, the carrier being preferably then elevated if the lamp is burning. If the carrier is elevated and is to be lowered the thumb pieces 16 are depressed and the carrier is permitted to descend to occupy the position shown by dot and dash lines shown in Fig. 1 in which position the openings 20, 29 and 30 are out of alignment with the lightshield 6 and are positioned to be penetrated by the light. \Vhen the portions of the cloth holders between which pieces of cloth were sandwiched are separated after the apparatus has-been in operation a desired length of time, the clothmay be removed and the fading action of the light thereupon may be observed by noting the contrast between the portions of the cloth that were in registry with the openings 20, 29 and 30 and the the fadingaction thereof upon the cloth.

The light obstructing portions of the cloth holders are preferably opaque but it is obvious that these portions of the holders mav be constructed of material that will permit the passage of the light but will so modify the light in its passage as to deprive it of its fading action.

It is obvious that the apparatus of my invention may be employed for holding other objects than cloth and may also be used for enabling light to have other action upon such objects than fading action.

As I have illustrated the invention the resistance 34 that is in series with the carbons of the arc lamp is provided upon the exterior of the lamp casing and is carried by and above the support 5, being positioned by insulators 35 that are carried by said support upon posts 36. The heat due to the current passing through the resistance creates a higher temperature within the upper portion of the upright tubular light shield 6 to induce flow of cooling air upwardly through said shield and the support 5 that is made in the form of a spider beneath the lamp so that the water in the.

pan will be subject to the heat of the lamp to nerate the-desired moisture.

hile I have herein shown' and particu-. larly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without' departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure cut the following a 1. Apparatus of the class described including an upright hollow light shield open for the circulation ofair therethrough; in combination with an electric lamp carried by the light shield with its li hti center below the same; a carrier mova le a on the light shield to elevate or lower. an o ject upon the carrier with reference to the lamp and light shield; and an electrical heat producing resistance included in the circuit of the lamp and located within light shield.

2. Apparatus of the class described including a hollow light shield open for the circulation of air therethrough; 1n combination with a source-of artificial li ht; an object carrier adjustable along the 11 ht shield;

and a'water container located low the source of artificial light and said carrier.

3. Apparatus of the clas described including a movable carrier; in combination 'with a source of artificial light; and a light light shield shield partially obstructing the light from said light source, thecarrier having a range of movement to enable a portion thereof to be brought-into and out of line with the light shield and light source.

4. Apparatus of the class described including a carrier; in combination with asource of artificial light; and a hollow light shield between the carrier and light source and from which said light source depends with its li hting center below the shield, the carrier ing movable along the light shield and having a range of movement to enable a portion thereof to be brought into and. out of line with the light shield and light source.

5. Apparatus of the class described including a vertical carrier; in combination with a source of artificial light; a vertical hollow light shield embraced by the carrier "and from which said light source :depends with its lighting center below the shield, the carrier being movable vertically along the and having. a .range of moveby Pattransmitting opening; and means for holdin an object in line with said opening.

Apparatus of the clam described including a carrier; in combination with a source of artificial light; a hollow light shield between the carrier and light source and from which said light source depends with its lighting center below the shield, the

. carrier bemg movable along the light shield and having a range of movement to enable a portion thereof to be brought into and out of line with the light shield and light source, the portion of the carrier movable into and out of line with the light shield and light source having a light transmitting opening; and means for holding an object in line with said opening.

8. Apparatus of the class described including a vertical carrier; in combination with a source of artificial light; a vertical hollow light shield embraced by the carrier and from which said light sourcedepends' ghting center below the shield, the

with its li carrier being movable vertically along the light shield and having a range of movement to enable a portion thereof to be brou ht into and out of line with the light shiel and light source, the portion of the carrier movable into and out of line with the light shield and light source having a light transmitting opening; and means for holding an object in line with said opening.

9. A device for testing the action of light in the form of a holder including two portions for holding an object therebetween that have registering areas for transmitting such light and registering areas adjacent the a oresaid areas that prevent the passage of such light; and a clamping device for pressin said portions together;

11 witness whereof, I hereunto subscribe my name this ninth day of May, A. D. 1921.

CLARENCE W. JAMESON. 

